Bugfix/kbdev 1115 get cancer genes

[mathieulemieux]

As per DEVSU-2032/DEVSU-2038 requirements.

Following datafix KBDEV-1084.

• Add a get_cancer_genes() function to retreive list of all unique genes with a 'cancer gene' statement.
• Refeactor get_oncokb_gene_list() into get_tumourigenesis_genes_list() allowing for a more generic usage

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (665b82a) 91.97% compared to head (5558922) 90.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
- Coverage   91.97%   90.33%   -1.65%     
==========================================
  Files           8        8              
  Lines         835      838       +3     
==========================================
- Hits          768      757      -11     
- Misses         67       81      +14     

Flag	Coverage Δ
unittests	90.33% <100.00%> (-1.65%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
graphkb/constants.py	93.61% <100.00%> (+0.28%)	⬆️
graphkb/genes.py	92.57% <100.00%> (+0.04%)	⬆️

... and 1 file with indirect coverage changes

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[mathieulemieux]

Expected returned values can be deduced from here: https://svn.bcgsc.ca/bitbucket/rest/api/1.0/projects/DAT/repos/knowledgebase_datafixes/attachments/53

[sshugsc]

looks good to me. would be better to write a test for get_cancer_genes()

The base branch was changed.